1 /* @(#)xdr.c 2.1 88/07/29 4.0 RPCSRC */
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31 static char sccsid[] = "@(#)xdr.c 1.35 87/08/12";
35 * xdr.c, Generic XDR routines implementation.
37 * Copyright (C) 1986, Sun Microsystems, Inc.
39 * These are the "generic" xdr routines used to serialize and de-serialize
40 * most common data items. See xdr.h for more info on the interface to
52 #include <rpc/types.h>
60 * constants specific to the xdr "protocol"
62 #define XDR_FALSE ((long) 0)
63 #define XDR_TRUE ((long) 1)
64 #define LASTUNSIGNED ((u_int) 0-1)
69 static const char xdr_zero[BYTES_PER_XDR_UNIT] = {0, 0, 0, 0};
72 * Free a data structure using XDR
73 * Not a filter, but a convenient utility nonetheless
76 xdr_free (xdrproc_t proc, char *objp)
97 xdr_int (XDR *xdrs, int *ip)
100 #if INT_MAX < LONG_MAX
107 return XDR_PUTLONG (xdrs, &l);
110 if (!XDR_GETLONG (xdrs, &l))
119 #elif INT_MAX == LONG_MAX
120 return xdr_long (xdrs, (long *) ip);
121 #elif INT_MAX == SHRT_MAX
122 return xdr_short (xdrs, (short *) ip);
124 #error unexpected integer sizes in_xdr_int()
129 * XDR unsigned integers
132 xdr_u_int (XDR *xdrs, u_int *up)
134 #if UINT_MAX < ULONG_MAX
141 return XDR_PUTLONG (xdrs, &l);
144 if (!XDR_GETLONG (xdrs, &l))
153 #elif UINT_MAX == ULONG_MAX
154 return xdr_u_long (xdrs, (u_long *) up);
155 #elif UINT_MAX == USHRT_MAX
156 return xdr_short (xdrs, (short *) up);
158 #error unexpected integer sizes in_xdr_u_int()
164 * The definition of xdr_long() is kept for backward
165 * compatibility. Instead xdr_int() should be used.
168 xdr_long (XDR *xdrs, long *lp)
171 if (xdrs->x_op == XDR_ENCODE
172 && (sizeof (int32_t) == sizeof (long)
173 || (int32_t) *lp == *lp))
174 return XDR_PUTLONG (xdrs, lp);
176 if (xdrs->x_op == XDR_DECODE)
177 return XDR_GETLONG (xdrs, lp);
179 if (xdrs->x_op == XDR_FREE)
186 * XDR unsigned long integers
187 * The definition of xdr_u_long() is kept for backward
188 * compatibility. Instead xdr_u_int() should be used.
191 xdr_u_long (XDR *xdrs, u_long *ulp)
199 if (XDR_GETLONG (xdrs, &tmp) == FALSE)
202 *ulp = (uint32_t) tmp;
207 if (sizeof (uint32_t) != sizeof (u_long)
208 && (uint32_t) *ulp != *ulp)
211 return XDR_PUTLONG (xdrs, (long *) ulp);
221 * same as xdr_u_hyper - open coded to save a proc call!
223 bool_t attribute_hidden
224 __xdr_hyper (XDR *xdrs, quad_t *llp)
227 unsigned long int t2;
229 if (xdrs->x_op == XDR_ENCODE)
231 t1 = (long) ((*llp) >> 32);
233 return (XDR_PUTLONG(xdrs, &t1) && XDR_PUTLONG(xdrs, &t2));
236 if (xdrs->x_op == XDR_DECODE)
238 if (!XDR_GETLONG(xdrs, &t1) || !XDR_GETLONG(xdrs, &t2))
240 *llp = ((quad_t) t1) << 32;
245 if (xdrs->x_op == XDR_FREE)
250 strong_alias(__xdr_hyper,xdr_hyper)
255 * same as xdr_hyper - open coded to save a proc call!
257 bool_t attribute_hidden
258 __xdr_u_hyper (XDR *xdrs, u_quad_t *ullp)
263 if (xdrs->x_op == XDR_ENCODE)
265 t1 = (unsigned long) ((*ullp) >> 32);
266 t2 = (unsigned long) (*ullp);
267 return (XDR_PUTLONG(xdrs, &t1) && XDR_PUTLONG(xdrs, &t2));
270 if (xdrs->x_op == XDR_DECODE)
272 if (!XDR_GETLONG(xdrs, &t1) || !XDR_GETLONG(xdrs, &t2))
274 *ullp = ((u_quad_t) t1) << 32;
279 if (xdrs->x_op == XDR_FREE)
284 strong_alias(__xdr_u_hyper,xdr_u_hyper)
287 xdr_longlong_t (XDR *xdrs, quad_t *llp)
289 return __xdr_hyper (xdrs, llp);
293 xdr_u_longlong_t (XDR *xdrs, u_quad_t *ullp)
295 return __xdr_u_hyper (xdrs, ullp);
302 xdr_short (XDR *xdrs, short *sp)
310 return XDR_PUTLONG (xdrs, &l);
313 if (!XDR_GETLONG (xdrs, &l))
327 * XDR unsigned short integers
330 xdr_u_short (XDR *xdrs, u_short *usp)
338 return XDR_PUTLONG (xdrs, &l);
341 if (!XDR_GETLONG (xdrs, &l))
359 xdr_char (XDR *xdrs, char *cp)
364 if (!xdr_int (xdrs, &i))
373 * XDR an unsigned char
376 xdr_u_char (XDR *xdrs, u_char *cp)
381 if (!xdr_u_int (xdrs, &u))
393 xdr_bool (XDR *xdrs, bool_t *bp)
400 lb = *bp ? XDR_TRUE : XDR_FALSE;
401 return XDR_PUTLONG (xdrs, &lb);
404 if (!XDR_GETLONG (xdrs, &lb))
408 *bp = (lb == XDR_FALSE) ? FALSE : TRUE;
421 xdr_enum (XDR *xdrs, enum_t *ep)
426 }; /* used to find the size of an enum */
429 * enums are treated as ints
431 if (sizeof (enum sizecheck) == 4)
433 #if INT_MAX < LONG_MAX
440 return XDR_PUTLONG (xdrs, &l);
443 if (!XDR_GETLONG (xdrs, &l))
454 return xdr_long (xdrs, (long *) ep);
457 else if (sizeof (enum sizecheck) == sizeof (short))
459 return xdr_short (xdrs, (short *) ep);
469 * Allows the specification of a fixed size sequence of opaque bytes.
470 * cp points to the opaque object and cnt gives the byte length.
473 xdr_opaque (XDR *xdrs, caddr_t cp, u_int cnt)
476 static char crud[BYTES_PER_XDR_UNIT];
479 * if no data we are done
485 * round byte count to full xdr units
487 rndup = cnt % BYTES_PER_XDR_UNIT;
489 rndup = BYTES_PER_XDR_UNIT - rndup;
494 if (!XDR_GETBYTES (xdrs, cp, cnt))
500 return XDR_GETBYTES (xdrs, (caddr_t)crud, rndup);
503 if (!XDR_PUTBYTES (xdrs, cp, cnt))
509 return XDR_PUTBYTES (xdrs, xdr_zero, rndup);
519 * *cpp is a pointer to the bytes, *sizep is the count.
520 * If *cpp is NULL maxsize bytes are allocated
523 xdr_bytes (xdrs, cpp, sizep, maxsize)
529 char *sp = *cpp; /* sp is the actual string pointer */
533 * first deal with the length since xdr bytes are counted
535 if (!xdr_u_int (xdrs, sizep))
540 if ((nodesize > maxsize) && (xdrs->x_op != XDR_FREE))
546 * now deal with the actual bytes
557 *cpp = sp = (char *) mem_alloc (nodesize);
562 if (_IO_fwide (stderr, 0) > 0)
563 (void) __fwprintf (stderr, L"%s", _("xdr_bytes: out of memory\n"));
566 (void) fputs (_("xdr_bytes: out of memory\n"), stderr);
572 return xdr_opaque (xdrs, sp, nodesize);
577 mem_free (sp, nodesize);
586 * Implemented here due to commonality of the object.
589 xdr_netobj (xdrs, np)
594 return xdr_bytes (xdrs, &np->n_bytes, &np->n_len, MAX_NETOBJ_SZ);
598 * XDR a discriminated union
599 * Support routine for discriminated unions.
600 * You create an array of xdrdiscrim structures, terminated with
601 * an entry with a null procedure pointer. The routine gets
602 * the discriminant value and then searches the array of xdrdiscrims
603 * looking for that value. It calls the procedure given in the xdrdiscrim
604 * to handle the discriminant. If there is no specific routine a default
605 * routine may be called.
606 * If there is no specific or default routine an error is returned.
609 xdr_union (xdrs, dscmp, unp, choices, dfault)
611 enum_t *dscmp; /* enum to decide which arm to work on */
612 char *unp; /* the union itself */
613 const struct xdr_discrim *choices; /* [value, xdr proc] for each arm */
614 xdrproc_t dfault; /* default xdr routine */
619 * we deal with the discriminator; it's an enum
621 if (!xdr_enum (xdrs, dscmp))
628 * search choices for a value that matches the discriminator.
629 * if we find one, execute the xdr routine for that value.
631 for (; choices->proc != NULL_xdrproc_t; choices++)
633 if (choices->value == dscm)
634 return (*(choices->proc)) (xdrs, unp, LASTUNSIGNED);
638 * no match - execute the default xdr routine if there is one
640 return ((dfault == NULL_xdrproc_t) ? FALSE :
641 (*dfault) (xdrs, unp, LASTUNSIGNED));
646 * Non-portable xdr primitives.
647 * Care should be taken when moving these routines to new architectures.
652 * XDR null terminated ASCII strings
653 * xdr_string deals with "C strings" - arrays of bytes that are
654 * terminated by a NULL character. The parameter cpp references a
655 * pointer to storage; If the pointer is null, then the necessary
656 * storage is allocated. The last parameter is the max allowed length
657 * of the string as specified by a protocol.
660 xdr_string (xdrs, cpp, maxsize)
665 char *sp = *cpp; /* sp is the actual string pointer */
670 * first deal with the length since xdr strings are counted-strings
677 return TRUE; /* already free */
679 /* fall through... */
683 size = __strlen (sp);
688 if (!xdr_u_int (xdrs, &size))
699 * now deal with the actual bytes
709 *cpp = sp = (char *) mem_alloc (nodesize);
713 if (_IO_fwide (stderr, 0) > 0)
714 (void) __fwprintf (stderr, L"%s",
715 _("xdr_string: out of memory\n"));
718 (void) fputs (_("xdr_string: out of memory\n"), stderr);
725 return xdr_opaque (xdrs, sp, size);
728 mem_free (sp, nodesize);
736 * Wrapper for xdr_string that can be called directly from
737 * routines like clnt_call
740 xdr_wrapstring (xdrs, cpp)
744 if (xdr_string (xdrs, cpp, LASTUNSIGNED))